The Forward Look Network
The Forward Look Network
Search | Statistics | User Listing Forums | Chat | eBay | Calendars | Albums | Skins | Language
You are logged in as a guest. ( logon | register )

Fuel Gauge Calibration
Jump to page : 1
Now viewing page 1 [50 messages per page]
View previous thread :: View next thread
   Forward Look Technical Discussions -> Electrical, Battery and ChargingMessage format
 
Powerflite
Posted 2016-11-17 7:50 PM (#526521)
Subject: Fuel Gauge Calibration



Expert 5K+

Posts: 9604
500020002000500100
Location: So. Cal
I purchased an NOS fuel gauge for my '58 Coronet. The seller told me that it didn't work, and I got it cheap. But upon testing it, it does sense the change in resistance, it is just off from where it should be. It reads full at around 120 ohms and half full at around 350 ohms. So is there a way to calibrate this to make it work well? I have thought of just putting some resistors inline before the sender to make it work better, but it would be better and more reliable, if I can get it closer to where it should be.

I have tried bending that copper track that covers the backend of the the needle as it moves, but it didn't seem to have much of an effect on it.

Edited by Powerflite 2016-11-17 7:53 PM




(Coronet Fuel Gauge.jpg)



Attachments
----------------
Attachments Coronet Fuel Gauge.jpg (173KB - 188 downloads)
Top of the page Bottom of the page
1960fury
Posted 2016-11-18 12:43 PM (#526564 - in reply to #526521)
Subject: RE: Fuel Gauge Calibration



Expert 5K+

Posts: 7385
50002000100100100252525
Location: northern germany
its just an ohmmeter, if that works you "calibrate" by bending the float bracket of the tank sending unit until it reads correctly.
Top of the page Bottom of the page
wizard
Posted 2016-11-18 1:28 PM (#526571 - in reply to #526521)
Subject: Re: Fuel Gauge Calibration



Board Moderator & Exner Expert 10K+

Posts: 13042
500050002000100025
Location: Southern Sweden - Sturkö island
With full tank, check the reading on the gauge and the reading of an ohm meter.
Note these values.
Lets say that the fuel gauge doesn't go upp to the full Reading; add a low value resistor between the connecton on the tank sender and the sender Cable.
Check reading on the gauge; if it's now on the full mark, then you add the prior ohm reading and the value of the resistor - this is the needed ohm Reading at full tank.

Now remove the tank sender and adjust the arm to the correct ohm reading in the full position.

Remove the added resistor/s and mount the tank sender - check the gauge and verify the full Reading.

Yes, it's a painful operation, but it will work.


Top of the page Bottom of the page
Powerflite
Posted 2016-11-18 2:32 PM (#526577 - in reply to #526571)
Subject: Re: Fuel Gauge Calibration



Expert 5K+

Posts: 9604
500020002000500100
Location: So. Cal
But, my point is that this is WAY off. The full reading on the sender is 10-15 ohms, and empty is 200 ohms. But the gauge is showing full at 120 and half full at 350. So it is a long ways off. Is there a way to calibrate the gauge itself to bring it closer to where it is supposed to work?
Top of the page Bottom of the page
57chizler
Posted 2016-11-19 4:45 PM (#526658 - in reply to #526521)
Subject: RE: Fuel Gauge Calibration



Expert

Posts: 3768
200010005001001002525
Location: NorCal

I bought a NOS gauge for my '57 Dodge and had about the same results...while the new gauge was in the mail I discovered that the original gauge would work if I tapped it with a hammer. I now carry a jeweler's hammer and tap the gauge with every startup.

Another unused part on the shelf because it was DOA.
Top of the page Bottom of the page
Powerflite
Posted 2016-12-10 3:12 PM (#528366 - in reply to #526658)
Subject: RE: Fuel Gauge Calibration



Expert 5K+

Posts: 9604
500020002000500100
Location: So. Cal
I am wondering if the problem with this gauge is that I am giving it a full 12 Volts. Is it expecting 5 volts instead? That would explain why it is so far off if that's how it is setup behind the dash. I don't know if they used voltage limiters in '57-'58 or not.
Top of the page Bottom of the page
LD3 Greg
Posted 2016-12-10 4:35 PM (#528369 - in reply to #528366)
Subject: RE: Fuel Gauge Calibration


Expert

Posts: 1906
1000500100100100100
Location: Ontario, Canada
No voltage limiters were used on 57/58 Mopars.

Greg
Top of the page Bottom of the page
5wndwcpe
Posted 2016-12-10 9:53 PM (#528389 - in reply to #528369)
Subject: RE: Fuel Gauge Calibration



Veteran

Posts: 131
10025
LD3 Greg - 2016-12-10 4:35 PM

No voltage limiters were used on 57/58 Mopars.

Greg


So the gauges see a full 12v then ?
Top of the page Bottom of the page
Jump to page : 1
Now viewing page 1 [50 messages per page]
Jump to forum :
Search this forum
Printer friendly version
E-mail a link to this thread

* * * This site contains affiliate links for which we may be compensated * * *


(Delete all cookies set by this site)